When all of the Marksman and Expert challenges for a weapon class (Assault, SMG's, etc.) are completed, the golden weapon for that weapon class is unlocked. The only exception is the Golden Desert Eagle, which is unlocked by reaching level 55 in Call of Duty 4: Modern Warfare. The golden gun in each weapon category are as follows:

"It took a lot of memory to add weapon camos and in most cases didn't look good on WWII guns. The memory was used to add/upgrade other gameplay features. We will never update the game to include weapon skins and it is unlikely we will do anything other than give XP for completing those Challenges."

— David Vahn Vonderhaar, a developer of World at War, mentioning headshot rewards.

There are no weapons camouflage skins in regularCall of Duty: World at War multiplayer. Instead, the player only gets experience points for completing the Expert Challenges. Although, in the Nazi Zombies level Der Riese, when a weapon is put in the Pack-a-Punch Machine, the gun gets a completely different look to it, namely, multiple strange engravings covering any metal finish of the gun. This has caused many players to ask Treyarch to patch multiplayer to have Pack-A-Punch skins as unlockables, though Treyarch has made no response.

Call of Duty: Modern Warfare 2 brings back the gunskins, or camos, but does not include the famous gold skins from Call of Duty 4: Modern Warfare. Each primary weapon, excluding the Riot Shield, can be fitted with a camo.